May/June 2010 - Keppel Offshore & Marine

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TECHNOLOGYA squeaky-clean solutionBefore the cleaningAfter the cleaningClose-up pictures of the tank surface conditions before and after cleaning using Bio-OSRThe surface condition oTank cleaning is a necessaryprocedure for tankers before theyundergo repair or conversions.The conventional tank cleaningmethod can be a potentiallydangerous operation as it requiresa large number of workers to enterthe tanks to manually scrape offthe oily sludge attached to thebulkheads and the interior.they also contain Volatile OrganicCompounds, which are toxic tohuman beings.In view of the potential hazards,KOMtech has developed a moreenvironmentally-friendly, effectiveand safer solvent, Bio-Oil & SludgeRemover (Bio-OSR) for tankcleaning.After the sludge has beenremoved from the tanks, tanksurfaces, both bulkheads and theinterior of the tanks have to bethoroughly cleaned. Conventionalpetrochemical-based solventsare normally used to clean thesurface. These solvents are madeof non-renewable petroleum andpetrochemical products, and theyare highly flammable. In addition,Unlike conventional cleaningsolvents Bio-OSR is formulatedwith biodiesel and some specialadditives, to meet the safetystandard and heavy duty cleaningrequirement. Bio-OSR is effectivein removing oily contaminantsassociated with oil storage andproduction systems. It has beentested in the shipyard and receivedpositive feedback.28OffshoreMarine May – June 2010
TECHNOLOGYOriginalconditionAfter cleaningusing Bio-OSRf FPSO heavy fuel oil tank before and after the cleaning with Bio-OSRTank cleaning is a necessary procedure for tankersbefore they undergo repairs or conversionsIn terms of physical and chemicalproperties, impact on humanhealth and the environment,and effectiveness in tankcleaning, Bio-OSR has advantagesover the conventional OSRs.Bio-OSR is much less flammableand combustible. It is not harmfulto humans or the environment. Itis ten times less toxic than tablesalt and does not contain anyhazardous air pollutants or ozonedepleting chemicals.Bio-OSR is highly biodegradable.If it is spilled accidentally, Bio-OSR biodegrades four to fivetimes faster than petroleumdiesel. In addition, it is madefrom renewable feedstock, andits production process generatesless hazardous waste than that ofpetroleum diesel.In addition, Bio-OSR is anexcellent solvent for heavy, waxyoil and sludge as it has a Kauributanol(KB) value as high as 60.Conventional OSR and petroleumdiesel, by comparison, onlyhave a KB value of around 50.Another feature of Bio-OSR is itsnatural lubricating property. Itwill lubricate the equipment andmachinery parts being cleaned.Currently, an enhanced version ofBio-OSR is being developed andprovide a dry surface without anyoily residual.OffshoreMarine May – June 201029
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May/June 2010 - Keppel Offshore & Marine

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